Rotary drilling rig, mast hydraulic control system and mast lifting up/ down control method

Abstract

The invention provides a rotary drilling rig, a mast hydraulic control system and a mast lifting up / down control method. The mast hydraulic control system comprises a left mast oil cylinder, a right mast oil cylinder, a jacking oil cylinder, a first reversing valve which is connected with the left mast oil cylinder, a second reversing valve which is connected with the right mast oil cylinder, a third reversing valve which is connected with the jacking oil cylinder, a left mast balancing valve, a right mast balancing valve, a jacking balancing valve, a first switching valve which is connected in parallel with the left mast balancing valve, a second switching valve which is connected in parallel with the right mast balancing valve, and a third switching valve which is connected between a head port of the jacking oil cylinder and the third reversing valve, wherein the third switching valve is provided with a connecting throttling position and a stopping position; when the third switching valve is at the connecting throttling position, oil in the head port of the jacking oil cylinder can slowly return through the connected third switching valve and a fifth pipeline. According to the mast hydraulic control system, a rear lying type big triangular mast lifting up / down hydraulic control system is adopted, so that the convenience of maintenance, mounting and dismounting is ensured, and moreover, the rock embedding stability is high.

Description

technical field [0001] The invention belongs to the technical field of pile foundation construction equipment, and in particular relates to a rotary drilling rig, a mast hydraulic control system, and a mast lifting / lowering control method. Background technique [0002] Rotary drilling rig is a modern large-scale mechanical equipment with electromechanical and hydraulic integration used for hole forming in pile foundation engineering, with strong operation cycle. The mast luffing mechanism is used to complete the lifting and vertical adjustment of the mast. Every operation position needs to adjust the mast luffing mechanism. The system drives the mast oil cylinder to drive the mast to move, and it is completed according to the actual situation of the rotary drilling rig work site. Lifting and vertical adjustment of the mast. [0003] At present, the mast luffing mechanism of traditional rotary drilling rigs is based on a large triangle structure and a parallelogram structure...

AI Technical Summary

Problems solved by technology

[0003] At present, the mast luffing mechanism of traditional rotary drilling rigs is based on a large triangle structure and a parallelogram structure. The former is a large triangle front lying design. The system control logic is relatively simple, but maintenance, disassembly and assembly are inconvenient, and the requirements for the site are relatively high. High, inconvenient to transfer and transport; the latter has poor rock stability

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